Yes, as most of you understood, it is pinch flats that are the problem, not burping.
I’ll check the rim for damage, it is entirely possible that there are some rough edges, but the nature and location of the cuts suggests to me that this isn’t the problem.
It’s on a FS (Orange 5).
I don’t claim to be the best rider out there, but I think my technique is reasonably good. After a week of training with Andy Barlow from Dirt School in the Alps a few years ago, I make a conscious effort to ride light over the rough stuff and heavy on the smoother parts of the track where you want to brake or turn. I certainly try to pick a line, rather than ‘blunder through rocks’. Of course there’s plenty of room for improvement, but I do constantly think about how to improve my riding and would hope that I don’t ‘ride like a sack of spuds’. Of course, no matter how good a rider you are, there are going to be occasions when you need to weight the bike on a rocky part of the track and riding light isn’t an option (try riding light down the whole of Cave Dale or the Beast!).
It seems that different tyres and/or more pressure are probably the answer. I’d rather be replacing tyres than rims, so I think I’ll be sticking with Mavics. Still not sure whether to go for the EN821 or the Crossmax XL. The XL is a couple of mm wider than the 821, and quite a bit llighter, but a bit reluctant to go for something with non-standard spokes and hub (even though they look really cool).
Any suggestions for High Roller / HR2 style tyres that will be stronger but not gain too much weight?